161251776 has 112 divisors (see below), whose sum is σ = 541812480. Its totient is φ = 46068480.

The previous prime is 161251757. The next prime is 161251787. The reversal of 161251776 is 677152161.

It is a tau number, because it is divible by the number of its divisors (112).

It is a super-4 number, since 4×161251776⁴ (a number of 34 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 161251776.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5431 + ... + 18761.

Almost surely, 2^161251776 is an apocalyptic number.

161251776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161251776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270906240).

161251776 is an abundant number, since it is smaller than the sum of its proper divisors (380560704).

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

161251776 is a wasteful number, since it uses less digits than its factorization.

161251776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13359 (or 13343 counting only the distinct ones).

The product of its digits is 17640, while the sum is 36.

The square root of 161251776 is about 12698.4950289395. The cubic root of 161251776 is about 544.2956149940.

The spelling of 161251776 in words is "one hundred sixty-one million, two hundred fifty-one thousand, seven hundred seventy-six".