201661615502 has 4 divisors (see below), whose sum is σ = 302492423256. Its totient is φ = 100830807750.

The previous prime is 201661615487. The next prime is 201661615513. The reversal of 201661615502 is 205516166102.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50415403874 + ... + 50415403877.

It is an arithmetic number, because the mean of its divisors is an integer number (75623105814).

Almost surely, 2^201661615502 is an apocalyptic number.

201661615502 is a deficient number, since it is larger than the sum of its proper divisors (100830807754).

201661615502 is a wasteful number, since it uses less digits than its factorization.

201661615502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100830807753.

The product of its (nonzero) digits is 21600, while the sum is 35.

The spelling of 201661615502 in words is "two hundred one billion, six hundred sixty-one million, six hundred fifteen thousand, five hundred two".