66515116151491 has 32 divisors (see below), whose sum is σ = 78704285898240. Its totient is φ = 55001001355776.

The previous prime is 66515116151489. The next prime is 66515116151579. The reversal of 66515116151491 is 19415161151566.

It is not a de Polignac number, because 66515116151491 - 2¹ = 66515116151489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66515116154491) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1598247115 + ... + 1598288731.

It is an arithmetic number, because the mean of its divisors is an integer number (2459508934320).

Almost surely, 2^{66515116151491} is an apocalyptic number.

66515116151491 is a deficient number, since it is larger than the sum of its proper divisors (12189169746749).

66515116151491 is a wasteful number, since it uses less digits than its factorization.

66515116151491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48043.

The product of its digits is 972000, while the sum is 52.

The spelling of 66515116151491 in words is "sixty-six trillion, five hundred fifteen billion, one hundred sixteen million, one hundred fifty-one thousand, four hundred ninety-one".