61405807042 has 4 divisors (see below), whose sum is σ = 92108710566. Its totient is φ = 30702903520.

The previous prime is 61405807037. The next prime is 61405807081. The reversal of 61405807042 is 24070850416.

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., 61389477361 + 16329681 = 247769^2 + 4041^2 .

It is a junction number, because it is equal to n+sod(n) for n = 61405806992 and 61405807010.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15351451759 + ... + 15351451762.

Almost surely, 2^61405807042 is an apocalyptic number.

61405807042 is a deficient number, since it is larger than the sum of its proper divisors (30702903524).

61405807042 is a wasteful number, since it uses less digits than its factorization.

61405807042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30702903523.

The product of its (nonzero) digits is 53760, while the sum is 37.

The spelling of 61405807042 in words is "sixty-one billion, four hundred five million, eight hundred seven thousand, forty-two".