900621785653 has 4 divisors (see below), whose sum is σ = 907496761248. Its totient is φ = 893746810060.

The previous prime is 900621785579. The next prime is 900621785659. The reversal of 900621785653 is 356587126009.

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 a de Polignac number, because none of the positive numbers 2^k-900621785653 is a prime.

It is a super-2 number, since 2×900621785653² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 900621785653.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (900621785659) 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, 3437487601 + ... + 3437487862.

It is an arithmetic number, because the mean of its divisors is an integer number (226874190312).

Almost surely, 2^900621785653 is an apocalyptic number.

It is an amenable number.

900621785653 is a deficient number, since it is larger than the sum of its proper divisors (6874975595).

900621785653 is a wasteful number, since it uses less digits than its factorization.

900621785653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6874975594.

The product of its (nonzero) digits is 2721600, while the sum is 52.

The spelling of 900621785653 in words is "nine hundred billion, six hundred twenty-one million, seven hundred eighty-five thousand, six hundred fifty-three".