1601511345 has 60 divisors (see below), whose sum is σ = 3339610164. Its totient is φ = 732110400.

The previous prime is 1601511277. The next prime is 1601511407. The reversal of 1601511345 is 5431151061.

1601511345 is a `hidden beast` number, since 1 + 601 + 5 + 1 + 13 + 45 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 887980401 + 713530944 = 29799^2 + 26712^2 .

It is not a de Polignac number, because 1601511345 - 2¹⁷ = 1601380273 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 20506 + ... + 60195.

Almost surely, 2^1601511345 is an apocalyptic number.

1601511345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1601511345 is an abundant number, since it is smaller than the sum of its proper divisors (1738098819).

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

1601511345 is an equidigital number, since it uses as much as digits as its factorization.

1601511345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80732 (or 80716 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 1601511345 is about 40018.8873533485. The cubic root of 1601511345 is about 1169.9752460246.

The spelling of 1601511345 in words is "one billion, six hundred one million, five hundred eleven thousand, three hundred forty-five".