57121667490 has 32 divisors (see below), whose sum is σ = 138505328640. Its totient is φ = 15075408384.

The previous prime is 57121667429. The next prime is 57121667497. The reversal of 57121667490 is 9476612175.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (57121667497) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9811810 + ... + 9817629.

It is an arithmetic number, because the mean of its divisors is an integer number (4328291520).

Almost surely, 2^57121667490 is an apocalyptic number.

57121667490 is an abundant number, since it is smaller than the sum of its proper divisors (81383661150).

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

57121667490 is a wasteful number, since it uses less digits than its factorization.

57121667490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19629546.

The product of its (nonzero) digits is 635040, while the sum is 48.

The spelling of 57121667490 in words is "fifty-seven billion, one hundred twenty-one million, six hundred sixty-seven thousand, four hundred ninety".