77721832642 has 8 divisors (see below), whose sum is σ = 116586234432. Its totient is φ = 38859754500.

The previous prime is 77721832631. The next prime is 77721832717. The reversal of 77721832642 is 24623812777.

It is a sphenic number, since it is the product of 3 distinct primes.

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 in 3 ways as a sum of consecutive naturals, for example, 494734 + ... + 632617.

It is an arithmetic number, because the mean of its divisors is an integer number (14573279304).

Almost surely, 2^77721832642 is an apocalyptic number.

77721832642 is a deficient number, since it is larger than the sum of its proper divisors (38864401790).

77721832642 is a wasteful number, since it uses less digits than its factorization.

77721832642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1161824.

The product of its digits is 1580544, while the sum is 49.

The spelling of 77721832642 in words is "seventy-seven billion, seven hundred twenty-one million, eight hundred thirty-two thousand, six hundred forty-two".