37665651616 has 48 divisors (see below), whose sum is σ = 75812250024. Its totient is φ = 18414183424.

The previous prime is 37665651599. The next prime is 37665651619. The reversal of 37665651616 is 61615656673.

It can be written as a sum of positive squares in 4 ways, for example, as 37040851600 + 624800016 = 192460^2 + 24996^2 .

It is a super-2 number, since 2×37665651616² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (37665651619) 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, 459030 + ... + 534826.

Almost surely, 2^37665651616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 37665651616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37906125012).

37665651616 is an abundant number, since it is smaller than the sum of its proper divisors (38146598408).

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

37665651616 is a wasteful number, since it uses less digits than its factorization.

37665651616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76153 (or 76145 counting only the distinct ones).

The product of its digits is 4082400, while the sum is 52.

The spelling of 37665651616 in words is "thirty-seven billion, six hundred sixty-five million, six hundred fifty-one thousand, six hundred sixteen".