1553668457 has 4 divisors (see below), whose sum is σ = 1694911056. Its totient is φ = 1412425860.

The previous prime is 1553668439. The next prime is 1553668477. The reversal of 1553668457 is 7548663551.

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.

It is a cyclic number.

It is not a de Polignac number, because 1553668457 - 2¹⁰ = 1553667433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1553668477) 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, 70621283 + ... + 70621304.

It is an arithmetic number, because the mean of its divisors is an integer number (423727764).

Almost surely, 2^1553668457 is an apocalyptic number.

It is an amenable number.

1553668457 is a deficient number, since it is larger than the sum of its proper divisors (141242599).

1553668457 is a wasteful number, since it uses less digits than its factorization.

1553668457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141242598.

The product of its digits is 3024000, while the sum is 50.

The square root of 1553668457 is about 39416.6012867675. The cubic root of 1553668457 is about 1158.2068154947.

The spelling of 1553668457 in words is "one billion, five hundred fifty-three million, six hundred sixty-eight thousand, four hundred fifty-seven".