1501661601 has 24 divisors (see below), whose sum is σ = 2376110880. Its totient is φ = 906307200.

The previous prime is 1501661593. The next prime is 1501661621. The reversal of 1501661601 is 1061661051.

1501661601 is a `hidden beast` number, since 1 + 50 + 1 + 6 + 6 + 1 + 601 = 666.

It is not a de Polignac number, because 1501661601 - 2³ = 1501661593 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1501661621) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7611 + ... + 55328.

It is an arithmetic number, because the mean of its divisors is an integer number (99004620).

Almost surely, 2^1501661601 is an apocalyptic number.

1501661601 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1501661601 is a deficient number, since it is larger than the sum of its proper divisors (874449279).

1501661601 is a wasteful number, since it uses less digits than its factorization.

1501661601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63197 (or 63194 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 1501661601 is about 38751.2787014829. The cubic root of 1501661601 is about 1145.1367662060.

The spelling of 1501661601 in words is "one billion, five hundred one million, six hundred sixty-one thousand, six hundred one".