61725570251 has 2 divisors, whose sum is σ = 61725570252. Its totient is φ = 61725570250.

The previous prime is 61725570241. The next prime is 61725570353. The reversal of 61725570251 is 15207552716.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61725570251 - 2⁶ = 61725570187 is a prime.

It is a super-2 number, since 2×61725570251² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61725570199 and 61725570208.

It is not a weakly prime, because it can be changed into another prime (61725570241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30862785125 + 30862785126.

It is an arithmetic number, because the mean of its divisors is an integer number (30862785126).

Almost surely, 2^61725570251 is an apocalyptic number.

61725570251 is a deficient number, since it is larger than the sum of its proper divisors (1).

61725570251 is an equidigital number, since it uses as much as digits as its factorization.

61725570251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 147000, while the sum is 41.

The spelling of 61725570251 in words is "sixty-one billion, seven hundred twenty-five million, five hundred seventy thousand, two hundred fifty-one".