1661412527 has 2 divisors, whose sum is σ = 1661412528. Its totient is φ = 1661412526.

The previous prime is 1661412461. The next prime is 1661412547. The reversal of 1661412527 is 7252141661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1661412527 - 2¹⁶ = 1661346991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1661412547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830706263 + 830706264.

It is an arithmetic number, because the mean of its divisors is an integer number (830706264).

Almost surely, 2^1661412527 is an apocalyptic number.

1661412527 is a deficient number, since it is larger than the sum of its proper divisors (1).

1661412527 is an equidigital number, since it uses as much as digits as its factorization.

1661412527 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 35.

The square root of 1661412527 is about 40760.4284447551. The cubic root of 1661412527 is about 1184.3838956983.

The spelling of 1661412527 in words is "one billion, six hundred sixty-one million, four hundred twelve thousand, five hundred twenty-seven".