5161655551 has 4 divisors (see below), whose sum is σ = 5558705992. Its totient is φ = 4764605112.

The previous prime is 5161655537. The next prime is 5161655557. The reversal of 5161655551 is 1555561615.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1555561615 = 5 ⋅311112323.

It is a cyclic number.

It is not a de Polignac number, because 5161655551 - 2⁵ = 5161655519 is a prime.

It is a super-2 number, since 2×5161655551² = 53285376054338227202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5161655557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198525201 + ... + 198525226.

It is an arithmetic number, because the mean of its divisors is an integer number (1389676498).

Almost surely, 2^5161655551 is an apocalyptic number.

5161655551 is a deficient number, since it is larger than the sum of its proper divisors (397050441).

5161655551 is a wasteful number, since it uses less digits than its factorization.

5161655551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397050440.

The product of its digits is 112500, while the sum is 40.

The square root of 5161655551 is about 71844.6626479657. The cubic root of 5161655551 is about 1728.2093080964.

The spelling of 5161655551 in words is "five billion, one hundred sixty-one million, six hundred fifty-five thousand, five hundred fifty-one".