1021677661 has 8 divisors (see below), whose sum is σ = 1048451040. Its totient is φ = 995182032.

The previous prime is 1021677619. The next prime is 1021677719. The reversal of 1021677661 is 1667761201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1021677661 - 2¹⁵ = 1021644893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1021677661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021677361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61975 + ... + 76708.

It is an arithmetic number, because the mean of its divisors is an integer number (131056380).

Almost surely, 2^1021677661 is an apocalyptic number.

It is an amenable number.

1021677661 is a deficient number, since it is larger than the sum of its proper divisors (26773379).

1021677661 is a wasteful number, since it uses less digits than its factorization.

1021677661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138875.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 1021677661 is about 31963.6928561141. The cubic root of 1021677661 is about 1007.1742934257.

The spelling of 1021677661 in words is "one billion, twenty-one million, six hundred seventy-seven thousand, six hundred sixty-one".