77881986901 has 4 divisors (see below), whose sum is σ = 78348346272. Its totient is φ = 77415627532.

The previous prime is 77881986893. The next prime is 77881986913. The reversal of 77881986901 is 10968918877.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 77881986901 - 2³ = 77881986893 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 (77881980901) 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, 233179435 + ... + 233179768.

It is an arithmetic number, because the mean of its divisors is an integer number (19587086568).

Almost surely, 2^77881986901 is an apocalyptic number.

It is an amenable number.

77881986901 is a deficient number, since it is larger than the sum of its proper divisors (466359371).

77881986901 is a wasteful number, since it uses less digits than its factorization.

77881986901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466359370.

The product of its (nonzero) digits is 12192768, while the sum is 64.

The spelling of 77881986901 in words is "seventy-seven billion, eight hundred eighty-one million, nine hundred eighty-six thousand, nine hundred one".