1656617101 has 4 divisors (see below), whose sum is σ = 1656783072. Its totient is φ = 1656451132.

The previous prime is 1656617099. The next prime is 1656617107. The reversal of 1656617101 is 1017166561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1017166561 = 29 ⋅35074709.

It is a cyclic number.

It is not a de Polignac number, because 1656617101 - 2¹ = 1656617099 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 (1656617107) 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, 66985 + ... + 88318.

It is an arithmetic number, because the mean of its divisors is an integer number (414195768).

Almost surely, 2^1656617101 is an apocalyptic number.

It is an amenable number.

1656617101 is a deficient number, since it is larger than the sum of its proper divisors (165971).

1656617101 is a wasteful number, since it uses less digits than its factorization.

1656617101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165970.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 1656617101 is about 40701.5614073957. The cubic root of 1656617101 is about 1183.2432802109.

The spelling of 1656617101 in words is "one billion, six hundred fifty-six million, six hundred seventeen thousand, one hundred one".