1611609965 has 16 divisors (see below), whose sum is σ = 2213283072. Its totient is φ = 1103566464.

The previous prime is 1611609959. The next prime is 1611609971. The reversal of 1611609965 is 5699061161.

It is an interprime number because it is at equal distance from previous prime (1611609959) and next prime (1611609971).

It is not a de Polignac number, because 1611609965 - 2⁴ = 1611609949 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6224 + ... + 57113.

It is an arithmetic number, because the mean of its divisors is an integer number (138330192).

Almost surely, 2^1611609965 is an apocalyptic number.

It is an amenable number.

1611609965 is a deficient number, since it is larger than the sum of its proper divisors (601673107).

1611609965 is an equidigital number, since it uses as much as digits as its factorization.

1611609965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64076.

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 1611609965 is about 40144.8622491098. The cubic root of 1611609965 is about 1172.4292587983.

The spelling of 1611609965 in words is "one billion, six hundred eleven million, six hundred nine thousand, nine hundred sixty-five".