1025651661 has 4 divisors (see below), whose sum is σ = 1367535552. Its totient is φ = 683767772.

The previous prime is 1025651657. The next prime is 1025651681. The reversal of 1025651661 is 1661565201.

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 1025651661 - 2² = 1025651657 is a prime.

It is a super-2 number, since 2×1025651661² = 2103922659424117842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1025651651) 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, 170941941 + ... + 170941946.

It is an arithmetic number, because the mean of its divisors is an integer number (341883888).

Almost surely, 2^1025651661 is an apocalyptic number.

It is an amenable number.

1025651661 is a deficient number, since it is larger than the sum of its proper divisors (341883891).

1025651661 is an equidigital number, since it uses as much as digits as its factorization.

1025651661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341883890.

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 1025651661 is about 32025.7968050757. The cubic root of 1025651661 is about 1008.4784661224.

The spelling of 1025651661 in words is "one billion, twenty-five million, six hundred fifty-one thousand, six hundred sixty-one".