66515116151490 has 64 divisors (see below), whose sum is σ = 159741074128896. Its totient is φ = 17725721579712.

The previous prime is 66515116151489. The next prime is 66515116151579. The reversal of 66515116151490 is 9415161151566.

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, 1631731849 + ... + 1631772611.

It is an arithmetic number, because the mean of its divisors is an integer number (2495954283264).

Almost surely, 2^{66515116151490} is an apocalyptic number.

66515116151490 is an abundant number, since it is smaller than the sum of its proper divisors (93225957977406).

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

66515116151490 is a wasteful number, since it uses less digits than its factorization.

66515116151490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75143.

The product of its (nonzero) digits is 972000, while the sum is 51.

The spelling of 66515116151490 in words is "sixty-six trillion, five hundred fifteen billion, one hundred sixteen million, one hundred fifty-one thousand, four hundred ninety".