1561451463 has 48 divisors (see below), whose sum is σ = 2665432224. Its totient is φ = 868366080.

The previous prime is 1561451459. The next prime is 1561451471. The reversal of 1561451463 is 3641541651.

1561451463 is a `hidden beast` number, since 1 + 56 + 145 + 1 + 463 = 666.

It is not a de Polignac number, because 1561451463 - 2² = 1561451459 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561451453) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 219145 + ... + 226157.

It is an arithmetic number, because the mean of its divisors is an integer number (55529838).

Almost surely, 2^1561451463 is an apocalyptic number.

1561451463 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1561451463 is a deficient number, since it is larger than the sum of its proper divisors (1103980761).

1561451463 is a wasteful number, since it uses less digits than its factorization.

1561451463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7216 (or 7213 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 1561451463 is about 39515.2054657444. The cubic root of 1561451463 is about 1160.1375835126.

The spelling of 1561451463 in words is "one billion, five hundred sixty-one million, four hundred fifty-one thousand, four hundred sixty-three".