1661411801 has 16 divisors (see below), whose sum is σ = 1909929600. Its totient is φ = 1415715840.

The previous prime is 1661411761. The next prime is 1661411821. The reversal of 1661411801 is 1081141661.

It is not a de Polignac number, because 1661411801 - 2¹⁸ = 1661149657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1661411821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1039535 + ... + 1041131.

It is an arithmetic number, because the mean of its divisors is an integer number (119370600).

Almost surely, 2^1661411801 is an apocalyptic number.

It is an amenable number.

1661411801 is a deficient number, since it is larger than the sum of its proper divisors (248517799).

1661411801 is a wasteful number, since it uses less digits than its factorization.

1661411801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2384.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 1661411801 is about 40760.4195390577. The cubic root of 1661411801 is about 1184.3837231819.

The spelling of 1661411801 in words is "one billion, six hundred sixty-one million, four hundred eleven thousand, eight hundred one".