87121755607384 has 8 divisors (see below), whose sum is σ = 163353291763860. Its totient is φ = 43560877803688.

The previous prime is 87121755607363. The next prime is 87121755607387. The reversal of 87121755607384 is 48370655712178.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×87121755607384² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87121755607387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5445109725454 + ... + 5445109725469.

Almost surely, 2^{87121755607384} is an apocalyptic number.

It is an amenable number.

87121755607384 is a deficient number, since it is larger than the sum of its proper divisors (76231536156476).

87121755607384 is a wasteful number, since it uses less digits than its factorization.

87121755607384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10890219450929 (or 10890219450925 counting only the distinct ones).

The product of its (nonzero) digits is 79027200, while the sum is 64.

The spelling of 87121755607384 in words is "eighty-seven trillion, one hundred twenty-one billion, seven hundred fifty-five million, six hundred seven thousand, three hundred eighty-four".