61537371257231 has 4 divisors (see below), whose sum is σ = 61538248165464. Its totient is φ = 61536494349000.

The previous prime is 61537371257189. The next prime is 61537371257233. The reversal of 61537371257231 is 13275217373516.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61537371257231 - 2¹⁴ = 61537371240847 is a prime.

It is a super-2 number, since 2×61537371257231² (a number of 28 digits) 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 (61537371257233) 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, 438348845 + ... + 438489206.

It is an arithmetic number, because the mean of its divisors is an integer number (15384562041366).

Almost surely, 2^{61537371257231} is an apocalyptic number.

61537371257231 is a deficient number, since it is larger than the sum of its proper divisors (876908233).

61537371257231 is an equidigital number, since it uses as much as digits as its factorization.

61537371257231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876908232.

The product of its digits is 5556600, while the sum is 53.

The spelling of 61537371257231 in words is "sixty-one trillion, five hundred thirty-seven billion, three hundred seventy-one million, two hundred fifty-seven thousand, two hundred thirty-one".