161503677550 has 48 divisors (see below), whose sum is σ = 314715428352. Its totient is φ = 61584415200.

The previous prime is 161503677539. The next prime is 161503677611. The reversal of 161503677550 is 55776305161.

It is a self number, because there is not a number n which added to its sum of digits gives 161503677550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 673732 + ... + 881431.

It is an arithmetic number, because the mean of its divisors is an integer number (6556571424).

Almost surely, 2^161503677550 is an apocalyptic number.

161503677550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161503677550 is a deficient number, since it is larger than the sum of its proper divisors (153211750802).

161503677550 is a wasteful number, since it uses less digits than its factorization.

161503677550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1555273 (or 1555268 counting only the distinct ones).

The product of its (nonzero) digits is 661500, while the sum is 46.

The spelling of 161503677550 in words is "one hundred sixty-one billion, five hundred three million, six hundred seventy-seven thousand, five hundred fifty".