77102020213 has 4 divisors (see below), whose sum is σ = 77145410860. Its totient is φ = 77058629568.

The previous prime is 77102020199. The next prime is 77102020223. The reversal of 77102020213 is 31202020177.

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

It can be written as a sum of positive squares in 2 ways, for example, as 53797555249 + 23304464964 = 231943^2 + 152658^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77102020213 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 (77102020223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21692658 + ... + 21696211.

It is an arithmetic number, because the mean of its divisors is an integer number (19286352715).

Almost surely, 2^77102020213 is an apocalyptic number.

It is an amenable number.

77102020213 is a deficient number, since it is larger than the sum of its proper divisors (43390647).

77102020213 is a wasteful number, since it uses less digits than its factorization.

77102020213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43390646.

The product of its (nonzero) digits is 1176, while the sum is 25.

The spelling of 77102020213 in words is "seventy-seven billion, one hundred two million, twenty thousand, two hundred thirteen".