51513455545 has 8 divisors (see below), whose sum is σ = 63323857800. Its totient is φ = 40205623680.

The previous prime is 51513455533. The next prime is 51513455551. The reversal of 51513455545 is 54555431515.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15776784 + 51497678761 = 3972^2 + 226931^2 .

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

It is not a de Polignac number, because 51513455545 - 2⁹ = 51513455033 is a prime.

It is a super-2 number, since 2×51513455545² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125642370 + ... + 125642779.

It is an arithmetic number, because the mean of its divisors is an integer number (7915482225).

Almost surely, 2^51513455545 is an apocalyptic number.

It is an amenable number.

51513455545 is a deficient number, since it is larger than the sum of its proper divisors (11810402255).

51513455545 is a wasteful number, since it uses less digits than its factorization.

51513455545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251285195.

The product of its digits is 750000, while the sum is 43.

The spelling of 51513455545 in words is "fifty-one billion, five hundred thirteen million, four hundred fifty-five thousand, five hundred forty-five".