61557191495 has 16 divisors (see below), whose sum is σ = 74008945920. Its totient is φ = 49152282624.

The previous prime is 61557191473. The next prime is 61557191497. The reversal of 61557191495 is 59419175516.

It is a cyclic number.

It is not a de Polignac number, because 61557191495 - 2¹⁴ = 61557175111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61557191497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12252554 + ... + 12257576.

It is an arithmetic number, because the mean of its divisors is an integer number (4625559120).

Almost surely, 2^61557191495 is an apocalyptic number.

61557191495 is a deficient number, since it is larger than the sum of its proper divisors (12451754425).

61557191495 is a wasteful number, since it uses less digits than its factorization.

61557191495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9194.

The product of its digits is 1701000, while the sum is 53.

The spelling of 61557191495 in words is "sixty-one billion, five hundred fifty-seven million, one hundred ninety-one thousand, four hundred ninety-five".