1245025661 has 8 divisors (see below), whose sum is σ = 1359010848. Its totient is φ = 1131174000.

The previous prime is 1245025643. The next prime is 1245025739. The reversal of 1245025661 is 1665205421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1245025661 - 2¹⁰ = 1245024637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245025631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13355 + ... + 51656.

It is an arithmetic number, because the mean of its divisors is an integer number (169876356).

Almost surely, 2^1245025661 is an apocalyptic number.

1245025661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1245025661 is a deficient number, since it is larger than the sum of its proper divisors (113985187).

1245025661 is a wasteful number, since it uses less digits than its factorization.

1245025661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66763.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 1245025661 is about 35284.9211562106. The cubic root of 1245025661 is about 1075.7865269008.

The spelling of 1245025661 in words is "one billion, two hundred forty-five million, twenty-five thousand, six hundred sixty-one".