1516145644 has 72 divisors (see below), whose sum is σ = 3010452480. Its totient is φ = 666993600.

The previous prime is 1516145639. The next prime is 1516145647. The reversal of 1516145644 is 4465416151.

It is a super-2 number, since 2×1516145644² = 4597395227640349472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1516145647) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1487367 + ... + 1488385.

It is an arithmetic number, because the mean of its divisors is an integer number (41811840).

Almost surely, 2^1516145644 is an apocalyptic number.

It is an amenable number.

1516145644 is a deficient number, since it is larger than the sum of its proper divisors (1494306836).

1516145644 is a wasteful number, since it uses less digits than its factorization.

1516145644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1151 (or 1136 counting only the distinct ones).

The product of its digits is 57600, while the sum is 37.

The square root of 1516145644 is about 38937.7149303859. The cubic root of 1516145644 is about 1148.8067380803.

The spelling of 1516145644 in words is "one billion, five hundred sixteen million, one hundred forty-five thousand, six hundred forty-four".