1661600601 has 32 divisors (see below), whose sum is σ = 2498496000. Its totient is φ = 1091211264.

The previous prime is 1661600581. The next prime is 1661600609. The reversal of 1661600601 is 1060061661.

It is not a de Polignac number, because 1661600601 - 2¹³ = 1661592409 is a prime.

It is a super-2 number, since 2×1661600601² = 5521833114487122402, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (1661600609) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1639771 + ... + 1640783.

It is an arithmetic number, because the mean of its divisors is an integer number (78078000).

Almost surely, 2^1661600601 is an apocalyptic number.

It is an amenable number.

1661600601 is a deficient number, since it is larger than the sum of its proper divisors (836895399).

1661600601 is a wasteful number, since it uses less digits than its factorization.

1661600601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1870 (or 1864 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 1661600601 is about 40762.7354455022. The cubic root of 1661600601 is about 1184.4285852639.

The spelling of 1661600601 in words is "one billion, six hundred sixty-one million, six hundred thousand, six hundred one".