61581330393974 has 4 divisors (see below), whose sum is σ = 92371995590964. Its totient is φ = 30790665196986.

The previous prime is 61581330393953. The next prime is 61581330393991. The reversal of 61581330393974 is 47939303318516.

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

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 as a sum of consecutive naturals, namely, 15395332598492 + ... + 15395332598495.

It is an arithmetic number, because the mean of its divisors is an integer number (23092998897741).

Almost surely, 2^{61581330393974} is an apocalyptic number.

61581330393974 is a deficient number, since it is larger than the sum of its proper divisors (30790665196990).

61581330393974 is a wasteful number, since it uses less digits than its factorization.

61581330393974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30790665196989.

The product of its (nonzero) digits is 44089920, while the sum is 62.

The spelling of 61581330393974 in words is "sixty-one trillion, five hundred eighty-one billion, three hundred thirty million, three hundred ninety-three thousand, nine hundred seventy-four".