635669197680 has 160 divisors (see below), whose sum is σ = 2152834852608. Its totient is φ = 153878169600.

The previous prime is 635669197679. The next prime is 635669197729. The reversal of 635669197680 is 86791966536.

It is a Harshad number since it is a multiple of its sum of digits (66).

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, 1650012 + ... + 1998468.

Almost surely, 2^635669197680 is an apocalyptic number.

635669197680 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 635669197680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1076417426304).

635669197680 is an abundant number, since it is smaller than the sum of its proper divisors (1517165654928).

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

635669197680 is a wasteful number, since it uses less digits than its factorization.

635669197680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349175 (or 349169 counting only the distinct ones).

The product of its (nonzero) digits is 88179840, while the sum is 66.

The spelling of 635669197680 in words is "six hundred thirty-five billion, six hundred sixty-nine million, one hundred ninety-seven thousand, six hundred eighty".