61277404042 has 4 divisors (see below), whose sum is σ = 91916106066. Its totient is φ = 30638702020.

The previous prime is 61277404031. The next prime is 61277404063. The reversal of 61277404042 is 24040477216.

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., 52886660841 + 8390743201 = 229971^2 + 91601^2 .

It is a super-2 number, since 2×61277404042² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61277403992 and 61277404010.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15319351009 + ... + 15319351012.

Almost surely, 2^61277404042 is an apocalyptic number.

61277404042 is a deficient number, since it is larger than the sum of its proper divisors (30638702024).

61277404042 is a wasteful number, since it uses less digits than its factorization.

61277404042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30638702023.

The product of its (nonzero) digits is 75264, while the sum is 37.

The spelling of 61277404042 in words is "sixty-one billion, two hundred seventy-seven million, four hundred four thousand, forty-two".