17797640690 has 16 divisors (see below), whose sum is σ = 32038056792. Its totient is φ = 7118544384.

The previous prime is 17797640683. The next prime is 17797640711. The reversal of 17797640690 is 9604679771.

It can be written as a sum of positive squares in 4 ways, for example, as 17721200641 + 76440049 = 133121^2 + 8743^2 .

It is a super-2 number, since 2×17797640690² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102722 + ... + 214818.

Almost surely, 2^17797640690 is an apocalyptic number.

17797640690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

17797640690 is a deficient number, since it is larger than the sum of its proper divisors (14240416102).

17797640690 is a wasteful number, since it uses less digits than its factorization.

17797640690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127981.

The product of its (nonzero) digits is 4000752, while the sum is 56.

The spelling of 17797640690 in words is "seventeen billion, seven hundred ninety-seven million, six hundred forty thousand, six hundred ninety".