61726215731 has 2 divisors, whose sum is σ = 61726215732. Its totient is φ = 61726215730.

The previous prime is 61726215701. The next prime is 61726215769. The reversal of 61726215731 is 13751262716.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61726215731 - 2¹⁰ = 61726214707 is a prime.

It is a super-2 number, since 2×61726215731² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61726215701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30863107865 + 30863107866.

It is an arithmetic number, because the mean of its divisors is an integer number (30863107866).

Almost surely, 2^61726215731 is an apocalyptic number.

61726215731 is a deficient number, since it is larger than the sum of its proper divisors (1).

61726215731 is an equidigital number, since it uses as much as digits as its factorization.

61726215731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105840, while the sum is 41.

The spelling of 61726215731 in words is "sixty-one billion, seven hundred twenty-six million, two hundred fifteen thousand, seven hundred thirty-one".