61955355437 has 2 divisors, whose sum is σ = 61955355438. Its totient is φ = 61955355436.

The previous prime is 61955355433. The next prime is 61955355467. The reversal of 61955355437 is 73455355916.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47483024836 + 14472330601 = 217906^2 + 120301^2 .

It is a cyclic number.

It is not a de Polignac number, because 61955355437 - 2² = 61955355433 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61955355431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30977677718 + 30977677719.

It is an arithmetic number, because the mean of its divisors is an integer number (30977677719).

Almost surely, 2^61955355437 is an apocalyptic number.

It is an amenable number.

61955355437 is a deficient number, since it is larger than the sum of its proper divisors (1).

61955355437 is an equidigital number, since it uses as much as digits as its factorization.

61955355437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8505000, while the sum is 53.

The spelling of 61955355437 in words is "sixty-one billion, nine hundred fifty-five million, three hundred fifty-five thousand, four hundred thirty-seven".