61251145157 has 4 divisors (see below), whose sum is σ = 61310440620. Its totient is φ = 61191849696.

The previous prime is 61251145147. The next prime is 61251145171. The reversal of 61251145157 is 75154115216.

61251145157 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 2 ways, for example, as 49412399521 + 11838745636 = 222289^2 + 108806^2 .

It is a cyclic number.

It is not a de Polignac number, because 61251145157 - 2⁶ = 61251145093 is a prime.

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 61251145157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61251145147) 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, 29646182 + ... + 29648247.

It is an arithmetic number, because the mean of its divisors is an integer number (15327610155).

Almost surely, 2^61251145157 is an apocalyptic number.

It is an amenable number.

61251145157 is a deficient number, since it is larger than the sum of its proper divisors (59295463).

61251145157 is a wasteful number, since it uses less digits than its factorization.

61251145157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59295462.

The product of its digits is 42000, while the sum is 38.

The spelling of 61251145157 in words is "sixty-one billion, two hundred fifty-one million, one hundred forty-five thousand, one hundred fifty-seven".