61501514251 has 2 divisors, whose sum is σ = 61501514252. Its totient is φ = 61501514250.

The previous prime is 61501514233. The next prime is 61501514267. The reversal of 61501514251 is 15241510516.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61501514251 - 2²⁹ = 60964643339 is a prime.

It is not a weakly prime, because it can be changed into another prime (61501514651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30750757125 + 30750757126.

It is an arithmetic number, because the mean of its divisors is an integer number (30750757126).

Almost surely, 2^61501514251 is an apocalyptic number.

61501514251 is a deficient number, since it is larger than the sum of its proper divisors (1).

61501514251 is an equidigital number, since it uses as much as digits as its factorization.

61501514251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6000, while the sum is 31.

The spelling of 61501514251 in words is "sixty-one billion, five hundred one million, five hundred fourteen thousand, two hundred fifty-one".