697144544640 has 256 divisors, whose sum is σ = 2477857521600. Its totient is φ = 185242337280.

The previous prime is 697144544627. The next prime is 697144544737. The reversal of 697144544640 is 46445441796.

697144544640 is a `hidden beast` number, since 6 + 97 + 1 + 4 + 4 + 544 + 6 + 4 + 0 = 666.

It is a super-2 number, since 2×697144544640² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4783894 + ... + 4927466.

Almost surely, 2^697144544640 is an apocalyptic number.

697144544640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 697144544640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1238928760800).

697144544640 is an abundant number, since it is smaller than the sum of its proper divisors (1780712976960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

697144544640 is a wasteful number, since it uses less digits than its factorization.

697144544640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143882 (or 143864 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 54.

The spelling of 697144544640 in words is "six hundred ninety-seven billion, one hundred forty-four million, five hundred forty-four thousand, six hundred forty".