85391520477 has 4 divisors (see below), whose sum is σ = 113855360640. Its totient is φ = 56927680316.

The previous prime is 85391520463. The next prime is 85391520491. The reversal of 85391520477 is 77402519358.

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 an interprime number because it is at equal distance from previous prime (85391520463) and next prime (85391520491).

It is a cyclic number.

It is not a de Polignac number, because 85391520477 - 2⁶ = 85391520413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85391525477) 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, 14231920077 + ... + 14231920082.

It is an arithmetic number, because the mean of its divisors is an integer number (28463840160).

Almost surely, 2^85391520477 is an apocalyptic number.

It is an amenable number.

85391520477 is a deficient number, since it is larger than the sum of its proper divisors (28463840163).

85391520477 is a wasteful number, since it uses less digits than its factorization.

85391520477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28463840162.

The product of its (nonzero) digits is 2116800, while the sum is 51.

The spelling of 85391520477 in words is "eighty-five billion, three hundred ninety-one million, five hundred twenty thousand, four hundred seventy-seven".