61249390157 has 4 divisors (see below), whose sum is σ = 62112057696. Its totient is φ = 60386722620.

The previous prime is 61249390141. The next prime is 61249390159. The reversal of 61249390157 is 75109394216.

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 not a de Polignac number, because 61249390157 - 2⁴ = 61249390141 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 (61249390159) 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, 431333663 + ... + 431333804.

It is an arithmetic number, because the mean of its divisors is an integer number (15528014424).

Almost surely, 2^61249390157 is an apocalyptic number.

It is an amenable number.

61249390157 is a deficient number, since it is larger than the sum of its proper divisors (862667539).

61249390157 is an equidigital number, since it uses as much as digits as its factorization.

61249390157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862667538.

The product of its (nonzero) digits is 408240, while the sum is 47.

The spelling of 61249390157 in words is "sixty-one billion, two hundred forty-nine million, three hundred ninety thousand, one hundred fifty-seven".