161725617776 has 40 divisors (see below), whose sum is σ = 316949870160. Its totient is φ = 79935538176.

The previous prime is 161725617773. The next prime is 161725617793. The reversal of 161725617776 is 677716527161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161725617773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 648071 + ... + 862233.

It is an arithmetic number, because the mean of its divisors is an integer number (7923746754).

Almost surely, 2^161725617776 is an apocalyptic number.

161725617776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161725617776 is a deficient number, since it is larger than the sum of its proper divisors (155224252384).

161725617776 is a wasteful number, since it uses less digits than its factorization.

161725617776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214713 (or 214707 counting only the distinct ones).

The product of its digits is 5186160, while the sum is 56.

The spelling of 161725617776 in words is "one hundred sixty-one billion, seven hundred twenty-five million, six hundred seventeen thousand, seven hundred seventy-six".