61490430637 has 4 divisors (see below), whose sum is σ = 61577159740. Its totient is φ = 61403701536.

The previous prime is 61490430571. The next prime is 61490430733. The reversal of 61490430637 is 73603409416.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2451636196 + 59038794441 = 49514^2 + 242979^2 .

It is a cyclic number.

It is not a de Polignac number, because 61490430637 - 2³⁵ = 27130692269 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61490430593 and 61490430602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61490433637) 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 3 ways as a sum of consecutive naturals, for example, 43363488 + ... + 43364905.

It is an arithmetic number, because the mean of its divisors is an integer number (15394289935).

Almost surely, 2^61490430637 is an apocalyptic number.

It is an amenable number.

61490430637 is a deficient number, since it is larger than the sum of its proper divisors (86729103).

61490430637 is an equidigital number, since it uses as much as digits as its factorization.

61490430637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86729102.

The product of its (nonzero) digits is 326592, while the sum is 43.

The spelling of 61490430637 in words is "sixty-one billion, four hundred ninety million, four hundred thirty thousand, six hundred thirty-seven".