1661254503 has 16 divisors (see below), whose sum is σ = 2265980640. Its totient is φ = 1082294784.

The previous prime is 1661254459. The next prime is 1661254537. The reversal of 1661254503 is 3054521661.

1661254503 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1661254503 - 2⁸ = 1661254247 is a prime.

It is a super-3 number, since 3×1661254503³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661254583) 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, 10926 + ... + 58667.

It is an arithmetic number, because the mean of its divisors is an integer number (141623790).

Almost surely, 2^1661254503 is an apocalyptic number.

1661254503 is a deficient number, since it is larger than the sum of its proper divisors (604726137).

1661254503 is a wasteful number, since it uses less digits than its factorization.

1661254503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69778.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 1661254503 is about 40758.4899499479. The cubic root of 1661254503 is about 1184.3463439139.

The spelling of 1661254503 in words is "one billion, six hundred sixty-one million, two hundred fifty-four thousand, five hundred three".