61572651155437 has 2 divisors, whose sum is σ = 61572651155438. Its totient is φ = 61572651155436.

The previous prime is 61572651155381. The next prime is 61572651155443. The reversal of 61572651155437 is 73455115627516.

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., 51886824969001 + 9685826186436 = 7203251^2 + 3112206^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61572651155437 is a prime.

It is a super-4 number, since 4×61572651155437⁴ (a number of 56 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61572651155237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (43) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30786325577718 + 30786325577719.

It is an arithmetic number, because the mean of its divisors is an integer number (30786325577719).

Almost surely, 2^{61572651155437} is an apocalyptic number.

It is an amenable number.

61572651155437 is a deficient number, since it is larger than the sum of its proper divisors (1).

61572651155437 is an equidigital number, since it uses as much as digits as its factorization.

61572651155437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26460000, while the sum is 58.

The spelling of 61572651155437 in words is "sixty-one trillion, five hundred seventy-two billion, six hundred fifty-one million, one hundred fifty-five thousand, four hundred thirty-seven".