77652952221 has 16 divisors (see below), whose sum is σ = 111506764544. Its totient is φ = 47784250944.

The previous prime is 77652952219. The next prime is 77652952249. The reversal of 77652952221 is 12225925677.

It is not a de Polignac number, because 77652952221 - 2¹ = 77652952219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77652951221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1410015 + ... + 1464051.

It is an arithmetic number, because the mean of its divisors is an integer number (6969172784).

Almost surely, 2^77652952221 is an apocalyptic number.

It is an amenable number.

77652952221 is a deficient number, since it is larger than the sum of its proper divisors (33853812323).

77652952221 is a wasteful number, since it uses less digits than its factorization.

77652952221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90900.

The product of its digits is 1058400, while the sum is 48.

The spelling of 77652952221 in words is "seventy-seven billion, six hundred fifty-two million, nine hundred fifty-two thousand, two hundred twenty-one".