201651215400 has 144 divisors (see below), whose sum is σ = 717048107100. Its totient is φ = 50610493440.

The previous prime is 201651215357. The next prime is 201651215501. The reversal of 201651215400 is 4512156102.

201651215400 is a `hidden beast` number, since 2 + 0 + 1 + 651 + 2 + 1 + 5 + 4 + 0 + 0 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 135325393956 + 66325821444 = 367866^2 + 257538^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3264355 + ... + 3325554.

Almost surely, 2^201651215400 is an apocalyptic number.

201651215400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201651215400 is an abundant number, since it is smaller than the sum of its proper divisors (515396891700).

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

201651215400 is a wasteful number, since it uses less digits than its factorization.

201651215400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6589948 (or 6589936 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The spelling of 201651215400 in words is "two hundred one billion, six hundred fifty-one million, two hundred fifteen thousand, four hundred".