65640990030 has 64 divisors (see below), whose sum is σ = 196411488768. Its totient is φ = 13639685760.

The previous prime is 65640990017. The next prime is 65640990043. The reversal of 65640990030 is 3009904656.

It is an interprime number because it is at equal distance from previous prime (65640990017) and next prime (65640990043).

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 14205697 + ... + 14210316.

It is an arithmetic number, because the mean of its divisors is an integer number (3068929512).

Almost surely, 2^65640990030 is an apocalyptic number.

65640990030 is an abundant number, since it is smaller than the sum of its proper divisors (130770498738).

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

65640990030 is a wasteful number, since it uses less digits than its factorization.

65640990030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28416041.

The product of its (nonzero) digits is 174960, while the sum is 42.

The spelling of 65640990030 in words is "sixty-five billion, six hundred forty million, nine hundred ninety thousand, thirty".