671786554 has 16 divisors (see below), whose sum is σ = 1059816960. Its totient is φ = 318923280.

The previous prime is 671786551. The next prime is 671786587. The reversal of 671786554 is 455687176.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 671786498 and 671786507.

It is not an unprimeable number, because it can be changed into a prime (671786551) 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, 98934 + ... + 105505.

It is an arithmetic number, because the mean of its divisors is an integer number (66238560).

Almost surely, 2^671786554 is an apocalyptic number.

671786554 is a deficient number, since it is larger than the sum of its proper divisors (388030406).

671786554 is a wasteful number, since it uses less digits than its factorization.

671786554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204525.

The product of its digits is 1411200, while the sum is 49.

The square root of 671786554 is about 25918.8455375620. The cubic root of 671786554 is about 875.8110809705.

The spelling of 671786554 in words is "six hundred seventy-one million, seven hundred eighty-six thousand, five hundred fifty-four".