61256316157 has 4 divisors (see below), whose sum is σ = 61482354496. Its totient is φ = 61030277820.

The previous prime is 61256316091. The next prime is 61256316161. The reversal of 61256316157 is 75161365216.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61256316157 - 2¹⁹ = 61255791869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61256316167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113018763 + ... + 113019304.

It is an arithmetic number, because the mean of its divisors is an integer number (15370588624).

Almost surely, 2^61256316157 is an apocalyptic number.

It is an amenable number.

61256316157 is a deficient number, since it is larger than the sum of its proper divisors (226038339).

61256316157 is a wasteful number, since it uses less digits than its factorization.

61256316157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226038338.

The product of its digits is 226800, while the sum is 43.

The spelling of 61256316157 in words is "sixty-one billion, two hundred fifty-six million, three hundred sixteen thousand, one hundred fifty-seven".