203156097990 has 128 divisors (see below), whose sum is σ = 524690749440. Its totient is φ = 50180456448.

The previous prime is 203156097979. The next prime is 203156097997. The reversal of 203156097990 is 99790651302.

It is a happy number.

It is a super-3 number, since 3×203156097990³ (a number of 35 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203156097997) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 30885582 + ... + 30892158.

It is an arithmetic number, because the mean of its divisors is an integer number (4099146480).

Almost surely, 2^203156097990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 203156097990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (262345374720).

203156097990 is an abundant number, since it is smaller than the sum of its proper divisors (321534651450).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

203156097990 is a wasteful number, since it uses less digits than its factorization.

203156097990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7806.

The product of its (nonzero) digits is 918540, while the sum is 51.

The spelling of 203156097990 in words is "two hundred three billion, one hundred fifty-six million, ninety-seven thousand, nine hundred ninety".