61256721742 has 16 divisors (see below), whose sum is σ = 95074452864. Its totient is φ = 29569932000.

The previous prime is 61256721727. The next prime is 61256721769. The reversal of 61256721742 is 24712765216.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 1147309 + ... + 1199512.

It is an arithmetic number, because the mean of its divisors is an integer number (5942153304).

Almost surely, 2^61256721742 is an apocalyptic number.

61256721742 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

61256721742 is a deficient number, since it is larger than the sum of its proper divisors (33817731122).

61256721742 is a wasteful number, since it uses less digits than its factorization.

61256721742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2347275.

The product of its digits is 282240, while the sum is 43.

The spelling of 61256721742 in words is "sixty-one billion, two hundred fifty-six million, seven hundred twenty-one thousand, seven hundred forty-two".