1661237635057 has 64 divisors (see below), whose sum is σ = 2291469078528. Its totient is φ = 1162239840000.

The previous prime is 1661237634949. The next prime is 1661237635097. The reversal of 1661237635057 is 7505367321661.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1661237635057 - 2⁷ = 1661237634929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1661237634995 and 1661237635013.

It is not an unprimeable number, because it can be changed into a prime (1661237635097) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 185587932 + ... + 185596882.

It is an arithmetic number, because the mean of its divisors is an integer number (35804204352).

Almost surely, 2^{1661237635057} is an apocalyptic number.

It is an amenable number.

1661237635057 is a deficient number, since it is larger than the sum of its proper divisors (630231443471).

1661237635057 is a wasteful number, since it uses less digits than its factorization.

1661237635057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14030.

The product of its (nonzero) digits is 4762800, while the sum is 52.

The spelling of 1661237635057 in words is "one trillion, six hundred sixty-one billion, two hundred thirty-seven million, six hundred thirty-five thousand, fifty-seven".