66457633031251 has 64 divisors (see below), whose sum is σ = 87827149670400. Its totient is φ = 48767086771200.

The previous prime is 66457633031249. The next prime is 66457633031287. The reversal of 66457633031251 is 15213033675466.

66457633031251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66457633031251 - 2¹ = 66457633031249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66457633031221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 353575285 + ... + 353763193.

It is an arithmetic number, because the mean of its divisors is an integer number (1372299213600).

Almost surely, 2^{66457633031251} is an apocalyptic number.

66457633031251 is a deficient number, since it is larger than the sum of its proper divisors (21369516639149).

66457633031251 is a wasteful number, since it uses less digits than its factorization.

66457633031251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191860.

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

The spelling of 66457633031251 in words is "sixty-six trillion, four hundred fifty-seven billion, six hundred thirty-three million, thirty-one thousand, two hundred fifty-one".