61239689842 has 4 divisors (see below), whose sum is σ = 91859534766. Its totient is φ = 30619844920.

The previous prime is 61239689821. The next prime is 61239689843. The reversal of 61239689842 is 24898693216.

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

It can be written as a sum of positive squares in only one way, i.e., 58980493881 + 2259195961 = 242859^2 + 47531^2 .

It is a super-2 number, since 2×61239689842² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61239689843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15309922459 + ... + 15309922462.

Almost surely, 2^61239689842 is an apocalyptic number.

61239689842 is a deficient number, since it is larger than the sum of its proper divisors (30619844924).

61239689842 is a wasteful number, since it uses less digits than its factorization.

61239689842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30619844923.

The product of its digits is 8957952, while the sum is 58.

The spelling of 61239689842 in words is "sixty-one billion, two hundred thirty-nine million, six hundred eighty-nine thousand, eight hundred forty-two".