2051605166557 has 8 divisors (see below), whose sum is σ = 2056553740512. Its totient is φ = 2046656950800.

The previous prime is 2051605166551. The next prime is 2051605166561. The reversal of 2051605166557 is 7556615061502.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2051605166557 - 2³ = 2051605166549 is a prime.

It is a super-2 number, since 2×2051605166557² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2051605166557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2051605166551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14067582 + ... + 14212672.

It is an arithmetic number, because the mean of its divisors is an integer number (257069217564).

Almost surely, 2^{2051605166557} is an apocalyptic number.

It is an amenable number.

2051605166557 is a deficient number, since it is larger than the sum of its proper divisors (4948573955).

2051605166557 is a wasteful number, since it uses less digits than its factorization.

2051605166557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179099.

The product of its (nonzero) digits is 1890000, while the sum is 49.

The spelling of 2051605166557 in words is "two trillion, fifty-one billion, six hundred five million, one hundred sixty-six thousand, five hundred fifty-seven".