1661397054 has 16 divisors (see below), whose sum is σ = 3326672640. Its totient is φ = 553152600.

The previous prime is 1661397013. The next prime is 1661397103. The reversal of 1661397054 is 4507931661.

It is a junction number, because it is equal to n+sod(n) for n = 1661396997 and 1661397015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156022 + ... + 166329.

It is an arithmetic number, because the mean of its divisors is an integer number (207917040).

Almost surely, 2^1661397054 is an apocalyptic number.

1661397054 is an abundant number, since it is smaller than the sum of its proper divisors (1665275586).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1661397054 is a wasteful number, since it uses less digits than its factorization.

1661397054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323215.

The product of its (nonzero) digits is 136080, while the sum is 42.

The square root of 1661397054 is about 40760.2386401257. The cubic root of 1661397054 is about 1184.3802189015.

The spelling of 1661397054 in words is "one billion, six hundred sixty-one million, three hundred ninety-seven thousand, fifty-four".