1610500661 has 16 divisors (see below), whose sum is σ = 2126010240. Its totient is φ = 1181114880.

The previous prime is 1610500649. The next prime is 1610500681. The reversal of 1610500661 is 1660050161.

It is not a de Polignac number, because 1610500661 - 2¹⁴ = 1610484277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1610500661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1610500601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 613856 + ... + 616473.

It is an arithmetic number, because the mean of its divisors is an integer number (132875640).

Almost surely, 2^1610500661 is an apocalyptic number.

1610500661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1610500661 is a deficient number, since it is larger than the sum of its proper divisors (515509579).

1610500661 is a wasteful number, since it uses less digits than its factorization.

1610500661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1230364.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 1610500661 is about 40131.0436071628. The cubic root of 1610500661 is about 1172.1601947332.

It can be divided in two parts, 1610500 and 661, that added together give a palindrome (1611161).

The spelling of 1610500661 in words is "one billion, six hundred ten million, five hundred thousand, six hundred sixty-one".