65661537436 has 24 divisors (see below), whose sum is σ = 128020951296. Its totient is φ = 29211127920.

The previous prime is 65661537329. The next prime is 65661537451. The reversal of 65661537436 is 63473516656.

It is a super-2 number, since 2×65661537436² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

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, 15873546 + ... + 15877681.

It is an arithmetic number, because the mean of its divisors is an integer number (5334206304).

Almost surely, 2^65661537436 is an apocalyptic number.

It is an amenable number.

65661537436 is a deficient number, since it is larger than the sum of its proper divisors (62359413860).

65661537436 is a wasteful number, since it uses less digits than its factorization.

65661537436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31751289 (or 31751287 counting only the distinct ones).

The product of its digits is 8164800, while the sum is 52.

The spelling of 65661537436 in words is "sixty-five billion, six hundred sixty-one million, five hundred thirty-seven thousand, four hundred thirty-six".