61243700642 has 16 divisors (see below), whose sum is σ = 97371524952. Its totient is φ = 28790307840.

The previous prime is 61243700627. The next prime is 61243700653. The reversal of 61243700642 is 24600734216.

It can be written as a sum of positive squares in 4 ways, for example, as 61231997401 + 11703241 = 247451^2 + 3421^2 .

It is a super-2 number, since 2×61243700642² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 912659 + ... + 977462.

Almost surely, 2^61243700642 is an apocalyptic number.

61243700642 is a deficient number, since it is larger than the sum of its proper divisors (36127824310).

61243700642 is a wasteful number, since it uses less digits than its factorization.

61243700642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1891093.

The product of its (nonzero) digits is 48384, while the sum is 35.

The spelling of 61243700642 in words is "sixty-one billion, two hundred forty-three million, seven hundred thousand, six hundred forty-two".