161720754 has 16 divisors (see below), whose sum is σ = 348321792. Its totient is φ = 49760208.

The previous prime is 161720719. The next prime is 161720759. The reversal of 161720754 is 457027161.

161720754 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (161720759) 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, 1036594 + ... + 1036749.

It is an arithmetic number, because the mean of its divisors is an integer number (21770112).

Almost surely, 2^161720754 is an apocalyptic number.

161720754 is an abundant number, since it is smaller than the sum of its proper divisors (186601038).

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

161720754 is a wasteful number, since it uses less digits than its factorization.

161720754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2073361.

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 161720754 is about 12716.9475110972. The cubic root of 161720754 is about 544.8227732248.

The spelling of 161720754 in words is "one hundred sixty-one million, seven hundred twenty thousand, seven hundred fifty-four".