637495989961 has 8 divisors (see below), whose sum is σ = 649917741600. Its totient is φ = 625128129600.

The previous prime is 637495989953. The next prime is 637495989967. The reversal of 637495989961 is 169989594736.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 637495989961 - 2³ = 637495989953 is a prime.

It is a super-2 number, since 2×637495989961² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (637495989967) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13448931 + ... + 13496248.

It is an arithmetic number, because the mean of its divisors is an integer number (81239717700).

Almost surely, 2^637495989961 is an apocalyptic number.

It is an amenable number.

637495989961 is a deficient number, since it is larger than the sum of its proper divisors (12421751639).

637495989961 is a wasteful number, since it uses less digits than its factorization.

637495989961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26945639.

The product of its digits is 793618560, while the sum is 76.

The spelling of 637495989961 in words is "six hundred thirty-seven billion, four hundred ninety-five million, nine hundred eighty-nine thousand, nine hundred sixty-one".