11721662007 has 16 divisors (see below), whose sum is σ = 17087020032. Its totient is φ = 7088483520.

The previous prime is 11721661981. The next prime is 11721662023. The reversal of 11721662007 is 70026612711.

It is not a de Polignac number, because 11721662007 - 2⁶ = 11721661943 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11721662107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 373543 + ... + 403704.

It is an arithmetic number, because the mean of its divisors is an integer number (1067938752).

Almost surely, 2^11721662007 is an apocalyptic number.

11721662007 is a deficient number, since it is larger than the sum of its proper divisors (5365358025).

11721662007 is a wasteful number, since it uses less digits than its factorization.

11721662007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777718.

The product of its (nonzero) digits is 7056, while the sum is 33.

The spelling of 11721662007 in words is "eleven billion, seven hundred twenty-one million, six hundred sixty-two thousand, seven".