90155336821 has 8 divisors (see below), whose sum is σ = 98479180800. Its totient is φ = 81852810240.

The previous prime is 90155336809. The next prime is 90155336837. The reversal of 90155336821 is 12863355109.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90155336821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90155336891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5320501 + ... + 5337418.

It is an arithmetic number, because the mean of its divisors is an integer number (12309897600).

Almost surely, 2^90155336821 is an apocalyptic number.

It is an amenable number.

90155336821 is a deficient number, since it is larger than the sum of its proper divisors (8323843979).

90155336821 is a wasteful number, since it uses less digits than its factorization.

90155336821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10658699.

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 90155336821 in words is "ninety billion, one hundred fifty-five million, three hundred thirty-six thousand, eight hundred twenty-one".