1545498998761 has 3 divisors (see below), whose sum is σ = 1545500241943. Its totient is φ = 1545497755580.

The previous prime is 1545498998759. The next prime is 1545498998903. The reversal of 1545498998761 is 1678998945451.

The square root of 1545498998761 is 1243181.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 1293635539161 + 251863459600 = 1137381^2 + 501860^2 .

It is not a de Polignac number, because 1545498998761 - 2¹ = 1545498998759 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1545498998161) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 621591 + ... + 1864771.

Almost surely, 2^{1545498998761} is an apocalyptic number.

1545498998761 is the 1243181-st square number.

1545498998761 is the 621591-st centered octagonal number.

It is an amenable number.

1545498998761 is a deficient number, since it is larger than the sum of its proper divisors (1243182).

1545498998761 is an frugal number, since it uses more digits than its factorization.

1545498998761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2486362 (or 1243181 counting only the distinct ones).

The product of its digits is 783820800, while the sum is 76.

The spelling of 1545498998761 in words is "one trillion, five hundred forty-five billion, four hundred ninety-eight million, nine hundred ninety-eight thousand, seven hundred sixty-one".