5661513901 has 4 divisors (see below), whose sum is σ = 5768334972. Its totient is φ = 5554692832.

The previous prime is 5661513877. The next prime is 5661513937. The reversal of 5661513901 is 1093151665.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3790864900 + 1870649001 = 61570^2 + 43251^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5661513901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5661513941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53410456 + ... + 53410561.

It is an arithmetic number, because the mean of its divisors is an integer number (1442083743).

Almost surely, 2^5661513901 is an apocalyptic number.

It is an amenable number.

5661513901 is a deficient number, since it is larger than the sum of its proper divisors (106821071).

5661513901 is a wasteful number, since it uses less digits than its factorization.

5661513901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106821070.

The product of its (nonzero) digits is 24300, while the sum is 37.

The square root of 5661513901 is about 75243.0322421950. The cubic root of 5661513901 is about 1782.2865347638.

The spelling of 5661513901 in words is "five billion, six hundred sixty-one million, five hundred thirteen thousand, nine hundred one".