61072786457 has 2 divisors, whose sum is σ = 61072786458. Its totient is φ = 61072786456.

The previous prime is 61072786393. The next prime is 61072786459. The reversal of 61072786457 is 75468727016.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46630515481 + 14442270976 = 215941^2 + 120176^2 .

It is a cyclic number.

It is not a de Polignac number, because 61072786457 - 2⁶ = 61072786393 is a prime.

It is a super-2 number, since 2×61072786457² (a number of 22 digits) contains 22 as substring.

Together with 61072786459, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 61072786399 and 61072786408.

It is not a weakly prime, because it can be changed into another prime (61072786459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30536393228 + 30536393229.

It is an arithmetic number, because the mean of its divisors is an integer number (30536393229).

Almost surely, 2^61072786457 is an apocalyptic number.

It is an amenable number.

61072786457 is a deficient number, since it is larger than the sum of its proper divisors (1).

61072786457 is an equidigital number, since it uses as much as digits as its factorization.

61072786457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3951360, while the sum is 53.

The spelling of 61072786457 in words is "sixty-one billion, seventy-two million, seven hundred eighty-six thousand, four hundred fifty-seven".