61955955437 has 2 divisors, whose sum is σ = 61955955438. Its totient is φ = 61955955436.

The previous prime is 61955955367. The next prime is 61955955517. The reversal of 61955955437 is 73455955916.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57047411716 + 4908543721 = 238846^2 + 70061^2 .

It is a cyclic number.

It is not a de Polignac number, because 61955955437 - 2¹⁴ = 61955939053 is a prime.

It is a super-2 number, since 2×61955955437² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61955355437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30977977718 + 30977977719.

It is an arithmetic number, because the mean of its divisors is an integer number (30977977719).

Almost surely, 2^61955955437 is an apocalyptic number.

It is an amenable number.

61955955437 is a deficient number, since it is larger than the sum of its proper divisors (1).

61955955437 is an equidigital number, since it uses as much as digits as its factorization.

61955955437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25515000, while the sum is 59.

The spelling of 61955955437 in words is "sixty-one billion, nine hundred fifty-five million, nine hundred fifty-five thousand, four hundred thirty-seven".