51665458021606 has 128 divisors (see below), whose sum is σ = 92910182400000. Its totient is φ = 21238966869120.

The previous prime is 51665458021603. The next prime is 51665458021663. The reversal of 51665458021606 is 60612085456615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51665458021603) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1704046915 + ... + 1704077233.

It is an arithmetic number, because the mean of its divisors is an integer number (725860800000).

Almost surely, 2^{51665458021606} is an apocalyptic number.

51665458021606 is a deficient number, since it is larger than the sum of its proper divisors (41244724378394).

51665458021606 is a wasteful number, since it uses less digits than its factorization.

51665458021606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31002.

The product of its (nonzero) digits is 10368000, while the sum is 55.

The spelling of 51665458021606 in words is "fifty-one trillion, six hundred sixty-five billion, four hundred fifty-eight million, twenty-one thousand, six hundred six".