57719191906 has 4 divisors (see below), whose sum is σ = 86578787862. Its totient is φ = 28859595952.

The previous prime is 57719191807. The next prime is 57719191919. The reversal of 57719191906 is 60919191775.

57719191906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 45366870025 + 12352321881 = 212995^2 + 111141^2 .

It is a super-2 number, since 2×57719191906² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14429797975 + ... + 14429797978.

Almost surely, 2^57719191906 is an apocalyptic number.

57719191906 is a deficient number, since it is larger than the sum of its proper divisors (28859595956).

57719191906 is a wasteful number, since it uses less digits than its factorization.

57719191906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28859595955.

The product of its (nonzero) digits is 1071630, while the sum is 55.

The spelling of 57719191906 in words is "fifty-seven billion, seven hundred nineteen million, one hundred ninety-one thousand, nine hundred six".